Rollup merge of #83055 - aDotInTheVoid:selective-strip-item-doc, r=jyn514

[rustdoc] Don't document stripped items in JSON renderer.

Fixes #80664, see [my comment there](https://github.com/rust-lang/rust/issues/80664#issuecomment-797557948) for why

Note that we already do something similar in `convert_item`:

bb4cdf8ec0/src/librustdoc/json/conversions.rs (L28-L31)

``@rustbot`` modify labels: +T-rustdoc +A-rustdoc-json

r? ``@jyn514``
cc ``@CraftSpider``

src/librustdoc/html/render/context.rs

@@ -290,6 +290,8 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
         "html"
     }
 
+    const RUN_ON_MODULE: bool = true;
+
     fn init(
         mut krate: clean::Crate,
         options: RenderOptions,